Concrete transporting truck



June 9, 1931. P. A.-KOEHRING 1,809,629

coucams 'mnsroa'rme 'rnucx Filed April 1. 1929 '2 Sheets-Sheet 1 gwuenkoz June 9, 1931.

P. A. KOEH RING CONCRETE TRANSPORTING TRUCK Filed April 1.

INVENTOR ATTORN EYS Patented June 9, 1931 UNITED STATES OFFICE PHILIP A. KOE'I-IR/ING, OF MILWAUKEE, WISCONSIN, ASSIGNOR T KOEI-IRING COM- PANY, OF MILWAUKEE, WISCONSIN,A CORPORATION .ooNcnErE rrvensron'rme TRUCK Application vfiledApril 1, 1929. Serial No. 351,773.

This invention has to do with the transportation of concrete aggregates, and relates primarily to a vehicle construction involving a truck having mounted thereon a truck body or drum adapted to contain the concrete aggregates and to convey these aggregates from the source of their supply to the site at which they are to be used.

g Preferably, the machine'of the invention 30 will carry the concrete aggregates in mixed wet condition. It is known that after the aggregates have been wet-mixed, they may be conveyed aconsiderable distance to the site at which they are to be used. However, it is desirable, if not absolutely necessary, that the aggregates be subjected to some degree of agitation while in transit, even though they have been properly admixed at a central mixing plant as the source of supply. If some agitation is not supplied-to the aggregates while in transit, there isa tendency'for the concrete to set While enroute, making it difficult to discharge the same from the drum or body in which it is transported. 1 i The primary aim of this inventionhas been to design a truck type machine or vehicle, capable of being moved with a high degree of mobility and in which the truck body or v drum containing the aggregatesis adapted "so to be operated to maintain the aggregates stirred 0r agitated'to some extent, and thus preventliability of their setting before discharged at the placeof' use. I

' In carrying outmy invention, I utilize a special design of truck body or drum, which is preferably tiltable, in order to discharge it, but which is especially novel because it creates the necessary agitation without the employment of special agitation devices in the drum to that would have to be driven for the above purpose. To this end, my drum or truck body is made of an irregular shape or form so that by slow revolution thereof, a tumbling or agitating efiect may be produced upon the "'45 contained aggregates.

- My invention also involves certain novel means for causing tilting action of the truck body and for returning it to normal position including certain automatic clutch and gear contrivances.

I have illustrated an exemplification of my invention in the accompanying drawings, in which Figure 1 is a side view of a motor truck equipped with a truck body and operating means for the latter embodying my invention.

Figure 2 is a vertical sectional view taken about on the line 22 of-Figure 1.

Figure 3 is an enlargedview bringing out more clearly the means for tilting the mixing drum or truck body.

Figure 4 is a sectional view taken about on the line 4-4c of Figure 1.

My invention represents a very simple arrangement and construction of parts that will be readily understood upon reference to the drawings, and referring to the latter, A

designates a motor truck of accepted design,

as used today for the transportation of large quantities of materials. The said truck includes the base frame B, the front steering wheels C and the'rear driving wheels I). A suitable cab 1 will be provided as usual. Upon the frame B of the truck, I mount my truck body'which is a container or drum 2. This drum-2 is provided with a supply openmg at its top adaptedto be closed by a suitable door 3. At its rearend, the drum 2 is provided with a tapering discharge portion l to facilitate the out-passage of materials when the body or drum 2 is being emptied.

Y A suitable door 5 will be used to close the discharge opening at the rear end aforesaid. The drum 2 is mounted upon trunnions 6 to facilitate the tilting thereof upwardly. from its front end, and at' the front end of said drum, is provided a driven gear ring 7 the teeth of which are in mesh with the driving gear 8 on the frame B of the machine. The gear 8 is mounted upon a shaft 9, driven from the motor of the truck, by which motor, traction is supplied through a main driving shaft 10 to the differential gearingat the rear axle of the machine. By the driving gear 8 when slowly operated, the drum2 maybe slowly turned before, during and after the transit period, orjuse of the truck, when it goes from the central mixing plant or source of supply to the place where the concrete is to be deposited.

Now, I have provided a simple means of causing slight agitation of the contents of the drum 2 without utilizing any special agi' tating contrivances that are required to be driven bypower within the drum or'body. To this end, the drum 2 is equipped with an inner wall structure comprising curvedsections 11, each section'uniting with the adjacent edges of adjacent sections at the point designated 12. The sections 11 of the wall structure might be characterized as having a sort of triple arc formation when viewed, in

cross section Figure 2,the curvature of the arc of each section 11, being much greater than the curvature of the general are circumscribed bythe'drum 2.

iVhile I have shown the wall structure aforesaid made up of sections 11 surrounded by a shell 2 and of heavier material than the shell, which is of comparatively light sheet metal, it is evident thatit is quite within the purview of my invention for the shell ofthe drum body 2 in which the wall structure is disposed to be dispensed with, under which conditions the drum or body 2 will comprise the wall structure alone and will simply be directly equipped with the gearring 7,,and supported bearings 13,instead of the latter being applied to the shell of the drum body, as shown in Figure 2. 7

It will be evident that the slow rotation of the 2 within the bearings 13 will cause the wall structure sections 11 to shift and slightly agitate the contents vof the drum through the irregular form of the wall struc tureitself. other words, the wall structure at the points 12, furnishes inwardly projectin abutments that will tend to lift and slight y carry upwards, and move through the materials of the concrete'aggregates so as to maintain the latter in motion and prevent liability of their setting. I

Fol-the discharge of my drum or aggre gates containing body 2, I utilize any suit able mechanism, but that illustrated includes a'gear segment 14 rigidly attached to the bearing 13 at the front end of the drum 2 and normally engaged by worm 15' on a worm shaft 16 carried by suitable bearing brackets 17, on the back of the cab 1. I

At the lower end of the worm shaft lt iis a bevel ear 18 adapted to be meshed with either of t'wo bevel gears 19 and 20.'The gears 19'andf2 0 are carried by the drivingshaft 9 previously referred to'as carrying the gear 8. Suitable manual levers 21ai1d22arepro vided adjacent to the driversseat, the lever 21 connected by'a link 23 with a lever 24;,jby which the gear 19 may be shifted into engagememwith-the gear 18 so as'to elevate the inner end of the drum or body 2. The'lever22 is connected by a link 25 with a lever 26 pivoted to the frame B and connected with the gear 20 so as to shift the last mentioned gear manually into engagement with the gear 18, should this be desired. An automatically acting lever 27 is pivoted to the side of the cab and connected by a link 28 with a crank lever 29 also pivoted at 3O to the side of the cab; and connected to the gear 19. An automatically operable lever 81 is pivoted to the frame B at 32 and attached by a link 33 to theilever. 26, aforesaid.

' WVith the'p'arts mounted and arranged as just set forth, when the front end of the truck body isb'eing elevated to discharge its contents, at a certain point in the upward movementofsaid'body at such end, an im pact pin 3 strikes the lever 27 and disengages the gear 19 automatically from the gear 18-tofstop 'said upward movement of the drum. The leverj22 maythen be thrown forward to bring the gear 20 into engagement with the gear 18' and cause adownward movement to restore the drum to its horizontal position. Thereupon, when the drum about reaches its lower extreme of movement, it willstrike at its inner end the lever 31an d rock the lever 26 rearwardly at itsupper end to disengage the gear 20 and discontinue the drive by which the drum is being lowered slowly to its horizontal position. 7 n

I have provided on the inner wall ofthe front 'end of the dru1n,'the baffle plates 35., which tend to cause the contents of the drum to be "moved toward the rearend of thesame. These baffle plates are really deflectors to deflect the contents of the container 2 rearwardly, in ,an obvious manner. V I

It is hardly necessary to' note that when the drum 2 is being fillecl,the door 3 will be opened to permit this operation incident to the 'feedingcf mixed aggregates into'the drum. For discharging the drum, the door 5 will be opened by any suitable manipulating means. v

Having thus described my invention,what I claim as new. and desire to secure by Letters Patent of theUnited States, is

1..Inj ai concrete mixing machine of the class described, in combination, a concrete mixing drum having'an internal shell having an interrupted periphery consisting of longitudinally extending sectors of equal convex contour, each. sector being generated, ona radius of equal length,"a-n outer cylindrical shell member havin a discharge end,'a-closed end remote therefrom, an inlet passing through the outer shell andlcominunicating with the internal shell, a closure for the dis charge and a closure for the inlet opening. 2. In'af concrete mixing machine 'ofthe class described, in combination, a concrete mixing -drum havinga shell having an interrupted periphery consisting of longitudinally extending sectors of'eq'ual convex contour, each sector being generatedfion; a radius of equal length, a truncated conical ShQill 'POF- the length of the mixing drum.

In testimony whereof I aflix my Signature.

PHILIP A. KOEHRING. 

